Chrome: It's not too cumbersome to delete your browser history in Chrome (Ctrl-Shift-Del on Windows or ⌘-Shift-Delete on Mac), but it takes a few seconds to check and uncheck boxes to suit your needs. Clear is a Chrome extension that adds an option to the right-click menu to do it instantly.

Typically in Chrome you have to bounce over to the Chrome Settings page and check a bunch of boxes to clear your browsing data. It's not hard, but Clear makes it even easier. Right-click, select Clear, and you have the option to clear out cache, history, or cookies by time period.